It’s paired up with a slick 8-speed automatic transmission that shifts effortlessly. There are three driving modes to choose from, starting with Normal and ending with the racy Sport+.
However, to get the very best out of it, we recommend adding the Adaptive Drive system. It lets you modify the gearbox, traction control, steering, engine and even suspension to improve driving dynamics.
Ultimate driving machine, then? Maybe ultimate road trip machine. There is literally zero body roll, plenty of grip, and the suspension ensures the ride quality is good.
Running costs are okay – could be better, but could also be worse. On average, you could return 31.7mpg economy from the 640i model, which might be a deal breaker for some buyers. Your yearly tax bill, meanwhile, will be a tenner short of £300. Servicing is on the expensive side, too, with its large tyres costing more cash than your average ones.
Still, it’s all about the experience with a car such as the BMW 640 Cabriolet, and with an excellent cabin and superb drivability, the experience is barely matched elsewhere. Indeed, the interior is spacious, comfortable, and there is quality everywhere. The leather seats are a highlight and are available across the whole range.
Practicality won’t be too much of an issue. No one expects a Cabriolet to be super useful, so a 350-litre boot is certainly a big plus. That’s enough to hold a few small suitcases or some golf clubs.
However, there isn’t much room in the rear. It’s billed as a four-seater, but the Mercedes offers more leg and headroom to all your passengers, making it more ideal if you’ll be travelling long distances will all the seats vacated.
Mercedes – £44,675 – £55,910
BMW – £67,000 – £79,900